Hand scanner with moveable platen
A hand scanner according to the invention may obtain an image of the hand and fingers including the bracelet crease/carpel delta area and palm surface regions up to the tips of the fingers using ultrasound measurement techniques. A hand scanner according to the invention may include a movable arcuate platen and an energy transducer. In a method according to the invention, the transducer may be moved back and forth while moving a platen surface in order to advance the hand and thereby produce a raster type scan image. In this manner, the image of the hand print may be collected as a raster image representative of the scanned surface of the friction ridge skin.
1. A hand scanner, comprising:
an ultrasonic energy transducer;
a movable arcuate platen configured to accommodate a hand on the platen, the platen configured to move about an axis of rotation and about the energy transducer, and configured to accommodate moving the hand about the axis of rotation; and,
a support platform having rollers in contact with the platen, a first of the rollers being positioned near an end of the platform and a second of the rollers being positioned near another end of the platform, and thereby configured to maintain a distance between the transducer and the platen as the platen moves relative to the support platform;
wherein the energy transducer is configured to move relative to the support platform and the platen, and in a direction that is substantially parallel to the axis of rotation, and
wherein the energy transducer is configured to send energy to the hand, and receive energy from the hand.
2. The scanner of claim 1 , wherein the support platform is in contact with the energy transducer.
3. The scanner of claim 2 , wherein the support platform has a length that can be altered in order to adjust a distance between the platen and the transducer.
4. A method of scanning a hand, comprising:
(a) providing an ultrasonic energy transducer;
(b) providing a movable arcuate platen, the platen being movable substantially about an axis of rotation;
(c) providing a support platform having rollers in contact with the platen, a first of the rollers being positioned near an end of the platform and a second of the rollers being positioned near another end of the platform, and thereby maintaining a distance between the transducer and the platen as the platen moves relative to the support platform and relative to the energy transducer about the axis of rotation;
wherein the energy transducer is movable relative to the support platform and the platen along an axis substantially parallel to the axis of rotation;
(d) placing a hand on the platen;
(e) moving the platen so as to move the platen and the hand about the axis of rotation;
(f) moving the energy transducer in the a first direction;
(g) sending energy toward the hand;
(h) reflecting at least some of the energy from the hand;
(i) receiving the energy reflected from the hand to provide reflected energy; and
(j) using the reflected energy to produce an image of the hand.
5. The method of claim 4 , further comprising moving the energy transducer in a direction opposite to the first direction.
6. The method of claim 4 , further comprising repeating steps (f) through (i) while the transducer is moving in the opposite direction.
7. The method of claim 4 , further comprising stopping the platen while the energy transducer is moving in the first direction.